Thought I'd post ORD pax service.
United-
United
ANA
American-
American
Iberia
All other US carriers handle themselves only.
Swissport-
Air Jamaica, Taca, Swiss, Asiana, Aeromexico, Royal Jordanian, KLM, Austrian, Aer Lingus, Mexicana
Worldwide Flight Services-
Turkish, Air India, Korean Air, LOT, Japan Airlines.
SGS-
SAS, bmi.
Sunline Services-
Air France, Lufthansa.